1542421440 has 280 divisors, whose sum is σ = 6271211232. Its totient is φ = 352512000.

The previous prime is 1542421421. The next prime is 1542421451. The reversal of 1542421440 is 441242451.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 177190 + ... + 185690.

Almost surely, 2^1542421440 is an apocalyptic number.

1542421440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1542421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3135605616).

1542421440 is an abundant number, since it is smaller than the sum of its proper divisors (4728789792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1542421440 is an equidigital number, since it uses as much as digits as its factorization.

1542421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8537 (or 8518 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 1542421440 is about 39273.6736249615. The cubic root of 1542421440 is about 1155.4052887005.

Adding to 1542421440 its reverse (441242451), we get a palindrome (1983663891).

It can be divided in two parts, 15424 and 21440, that added together give a square (36864 = 192²).

The spelling of 1542421440 in words is "one billion, five hundred forty-two million, four hundred twenty-one thousand, four hundred forty".